FRAM PH3980 vs FRAM PH9648: Oil Filter Compatibility
Compare FRAM PH3980 and FRAM PH9648 oil filters by compatibility, dimensions, thread size, gasket fit, bypass valve, anti-drainback valve status, and match confidence. Use this comparison as a fitment review, not as an automatic substitution guarantee. Both use a M18x1.5 thread.
Quick verdict
Both use a M18x1.5 thread.
- Thread size is the first hard-fit check for any comparison of spin-on filters.
- Gasket OD and gasket ID are the most important seal-related dimensions.
- Height differences can matter for clearance even when thread and gasket fit appear close.
- Bypass and anti-drainback differences may be important, depending on the application.
FRAM PH3980 and FRAM PH9648 specifications
How matching is scored| Specification | FRAM PH3980 | FRAM PH9648 |
|---|---|---|
| Thread size | M18X1,5 | M18X1,5 |
| Gasket OD | 71.1 mm | 70 mm |
| Gasket ID | 62.5 mm | 62 mm |
| Can OD | 75.79 mm | 68 mm |
| Height | 125.43 mm | 65 mm |
| Internal bypass valve | No | Yes |
| Bypass PSID | Not applicable | 12 |
| Anti-drainback valve | Yes | Yes |
What matters in this specific comparison
Thread size matches: both are M18x1.5.
Gasket OD differs by 1.1 mm (FRAM PH3980: 71.1 mm, FRAM PH9648: 70 mm).
Gasket ID differs by 0.5 mm (FRAM PH3980: 62.5 mm, FRAM PH9648: 62 mm).
FRAM PH3980 is 60.4 mm taller (FRAM PH3980: 125.43 mm, FRAM PH9648: 65 mm) -- check clearance before substituting.
Can OD differs by 7.8 mm (FRAM PH3980: 75.79 mm, FRAM PH9648: 68 mm).
Bypass valve presence differs: FRAM PH9648 has one, FRAM PH3980 does not.
Open related filters
Before substituting, verify thread fit, gasket sealing dimensions, height clearance, bypass behavior, and anti-drainback requirements for your specific application.